The Salted Fish – Tech and life

Roland SR-JV80 Re-writable ROM Card with ESP32

Tech/技术hardware, pcb, software, writeup4 Comments

For user manual and purchasing please visit: https://www.ddzheng.cc/?page_id=666 Update 13 Feb. 2025: The first batch run has finished. This will be also PVT. change to reverse mounted 1206 led on bottom side. Update 29 Jan 2025: Out of advice from Gearspace user I will add a header footprint for remote mounted button. I added ability ... Read More

Roland XP-80 LCD Replacement

Tech/技术hardware, repairLeave a Comment

Final modification for my XP-80, and you can do this as well

Korg Triton Repair and Restoration

Tech/技术hardware, repair, writeupLeave a Comment

A long time viewer of my Bilibili channel contacted me to do a restoration of his Korg Triton.

Tektronix DPO71254B Repair

Tech/技术hardware, repair, writeup1 Comment

There is a DPO71254B at my workplace that has been abandoned for quite a while. I repaired it so that we can use it to debug (no cal though)

Roland D-50 Repair

Tech/技术hardware, pcb, repair, writeupLeave a Comment

The long journey of restoring a Roland D-50

Oscilloscope Measurement Artifacts 1

Tech/技术hardware, measurement, writeupLeave a Comment

In this article I present some aspects that distort electrical signal measurement result, with focus on what happens in the scope itself after the signal has entered an oscilloscope.